光纤微缺陷的激光检测方法

A Laser Detection Method of Micro-defects for Optical Fibers

针对光纤微缺陷检测问题,提出了一种基于激光的光纤微缺陷检测方法,分析了光纤微缺陷的基本结构以及激光检测法的原理,并以此搭建了实验装置,进行了缺陷检测实验.实验中用准直氦氖激光束横向入射光纤,在光屏上得到光纤前向散射图样的分布图像,然后对图像进行处理.通过与显微镜观察法的实验结果比较,发现激光检测方法可有效地进行缺陷检测,其检测结果与显微镜直接观察法一致,可以作为光纤拉制后、涂覆层前的缺陷复测.

In order to solve the problem of inspecting the optical fiber defects, a detection method based laser was proposed to inspect the optical fiber defects in this paper. Though analyzing the basic structure of optical fiber defectstheoretically the principle of detection, a kind of experimental device was designed and established, which was used to carry out the detection experiments of the defects. In the experiment, a collimated He-Ne laser beam transverse incident fiber and the distribution image of optical forward scattering pattern on the optical scree were obtained for the next step image processing. Compared to the experimental results of the microscope method, it is found that the laser detection method is more effective to detect the defect of the optical fiber and has the same detection accuracy as the microscope method. The method can be used as a fiber drawing repetition measurement before coating the optical fiber.